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Pilot/Controller Glossary



AIRCRAFT− Device(s) that are used or intended to

be used for flight in the air, and when used in air traffic

control terminology, may include the flight crew.


AIRCRAFT [ICAO]− Any machine that can derive

support in the atmosphere from the reactions of the air

other than the reactions of the air against the earth’s



grouping of aircraft based on a speed of 1.3 times the

stall speed in the landing configuration at maximum

gross landing weight. An aircraft must fit in only one

category. If it is necessary to maneuver at speeds in

excess of the upper limit of a speed range for a

category, the minimums for the category for that

speed must be used. For example, an aircraft which

falls in Category A, but is circling to land at a speed

in excess of 91 knots, must use the approach

Category B minimums when circling to land. The

categories are as follows:

a. Category A− Speed less than 91 knots.
b. Category B− Speed 91 knots or more but less

than 121 knots.

c. Category C− Speed 121 knots or more but less

than 141 knots.

d. Category D− Speed 141 knots or more but less

than 166 knots.

e. Category E− Speed 166 knots or more.

(Refer to 14 CFR Part 97.)

AIRCRAFT CLASSES− For the purposes of Wake

Turbulence Separation Minima, ATC classifies

aircraft as Super, Heavy, Large, and Small as follows:

a. Super. The Airbus A-380-800 (A388) and the

Antonov An-225 (A225) are classified as super.

b. Heavy− Aircraft capable of takeoff weights of

300,000 pounds or more whether or not they are

operating at this weight during a particular phase of


c. Large− Aircraft of more than 41,000 pounds,

maximum certificated takeoff weight, up to but not

including 300,000 pounds.

d. Small− Aircraft of 41,000 pounds or less

maximum certificated takeoff weight.

(Refer to AIM.)

AIRCRAFT CONFLICT− Predicted conflict, within

EDST of two aircraft, or between aircraft and

airspace. A Red alert is used for conflicts when the

predicted minimum separation is 5 nautical miles or

less. A Yellow alert is used when the predicted

minimum separation is between 5 and approximately

12 nautical miles. A Blue alert is used for conflicts

between an aircraft and predefined airspace.





AIRCRAFT LIST (ACL)− A view available with

EDST that lists aircraft currently in or predicted to be

in a particular sector’s airspace. The view contains

textual flight data information in line format and may

be sorted into various orders based on the specific

needs of the sector team.






RECOVERY− Procedures used at USAF bases to

provide increased launch and recovery rates in

instrument flight rules conditions. ASLAR is based


a. Reduced separation between aircraft which is

based on time or distance. Standard arrival separation

applies between participants including multiple

flights until the DRAG point. The DRAG point is a

published location on an ASLAR approach where

aircraft landing second in a formation slows to a

predetermined airspeed. The DRAG point is the

reference point at which MARSA applies as

expanding elements effect separation within a flight

or between subsequent participating flights.

b. ASLAR procedures shall be covered in a Letter

of Agreement between the responsible USAF

military ATC facility and the concerned Federal

Aviation Administration facility. Initial Approach

Fix spacing requirements are normally addressed as

a minimum.

TION (AIRMET)−  In-flight weather advisories

issued only to amend the Aviation Surface Forecast,

Aviation Cloud Forecast, or area forecast concerning

weather phenomena which are of operational interest

to all aircraft and potentially hazardous to aircraft

having limited capability because of lack of

equipment, instrumentation, or pilot qualifications.

AIRMETs concern weather of less severity than that

covered by SIGMETs or Convective SIGMETs.